Queretaro Mexico Research Articles

Educational evaluation of renewable energy projects based on RETScreen software

In the design of renewable energy projects, a present problem is the techno-economic evaluation of them, regularly different methods and models are used to do it, in this work it is proposed to innovate in the degree of Engineering in Renewable Energies (LIER) of the UNAM in the National School of Superior Studies Juriquilla campus the way to evaluate projects using the software RETScreen. This paper presents a methodology to evaluate a wind energy project in the state of Queretaro Mexico. The project contemplates a wind turbine brand VESTAS V44 - 40m of 600 kW capacity of 40 m height in the state of Querétaro in the center of the country of Mexico. The initial costs of this wind turbine are 1,283 $/kW or 770,000 USD, with a rate of 80 $/kW. The electricity exported to the grid is 1,703 MWh and the income from electricity exports is 136,235.52 USD. With this wind turbine you can save 1,318.2 tCO2 per year or 566,414 liters of unused gasoline.

Epidemiology of orthopedic trauma admissions over year 2017 in the General Hospital H+ in Queretaro Mexico

Background: The dynamics of demography in MA©xico is changing and its population is aging. Osteoporotic and fragility fractures are diseases associated with aging and therefore its incidence is expected to grow accordingly. Methods: We conducted a retrospective study of epidemiological data contained on medical records of 50 years and older patients with fracture admitted over a 12-month period at the Orthopedic Service from the General Hospital H+ in Queretaro Mexico. Descriptive and inferential statistics methods for distribution of patients according to gender and age group were used. Qualitative variables were presented by distributions of absolute and relative frequencies and distributions assessed by chi-square method. Results: From 150 patients presented in the Emergency Unit, 32 patients were admitted in Orthopedic Service. Data of 32 medical records showed the most common age groups was 50 to 59 (male 44.4% - female 34.8%). The more frequent factures were in upper limbs (male 33.3% - female 47.8%), hip (male 11.1% - female 21.7%) and spinal bone (male 11.1% - female 4.3%). Most common mechanism of trauma was fall (male 44.4% - female 56.5%) where no less than 50% of patients had pre-existing illness (systemic arterial hypertension, Diabetes Mellitus II, Obesity, Smoking and alcoholism) as predisposition factors to factures. Only one patient was diagnosed with OP using BMD and only one patient received treatment for OP. Conclusion: The frequency of patients with the most common type and trauma mechanism of fractures admitted in the Orthopedic Unit was consistently increased in female than male gender and correlates with previous reports. It was noticed that exists a medical management of patients related to reliable diagnosis and timely treatment of fracture fragility and OP, not according to criteria issued by international health entities.

About this title ‐ Monogenetic Volcanism

The nature and origin of the small-scale volcanic systems, generally referred to as ‘monogenetic’, have enjoyed an elevated level of interest during the past decade. There has been recognition that their ostensibly simple volcano types are a window into the nature of explosive volcanism, landscape evolution and the processes of magma generation in the Earth's upper mantle. In the past few years, major conferences have offered specialized technical sessions dealing with monogenetic volcanism and there have been thematic conferences, such as the IAVCEI International Maar Conference series, which have provided a focus for discussion of volcanological and geochemical aspects of small-scale basaltic volcanism. Many new aspects of monogenetic volcanism have emerged and have clearly demonstrated that this volcanism can be very complex on a fine scale. This book is a collection of papers arising from two recent Maar Conferences (the fifth in Queretaro Mexico and the sixth in Changchun, China) and serves as a snapshot of current research on monogenetic volcanism.

Birth Intervals, Gestational Age, and Low Birth Weight: Are the Relationships Confounded?

A member of the US National Research Councils Committee on Population analyzed data on 2234 postpartum and postabortion patients at 2 Mexican Social Security Institute (IMSS) hospitals in Aguascalientes and Queretaro Mexico during October-November 1986 and March-April 1988 to determine whether or not gestational age confounds the relationship between birth intervals and low birth weight. Birth intervals and low birth weight were significantly associated both when gesttional age was and was not controlled (e.g. including gestational age odds ratio [OR] = 1.9 for 0-12 months and 1.65 for 13-21 months and excluding gestational age OR = 1.8 and 1.51 respectively; p < .05). Thus a short birth interval alone increased the likelihood of low birth weight a major predictor of neonatal mortality. Even though the researcher did not have data on maternal nutritional status the association between short intervals may keep mothers from replenishing nutritional reserves expended by the previous pregnancy and lactation. The researcher also controlled for other factors including mothers age height prepregnancy weight outcome of preceding pregnancy number of live births and education. These findings suggest that promotion of family planning use especially among women with adverse last pregnancy outcome would likely result in longer birth intervals thereby reducing the number of low birth weight infants. Prenatal care promotion among women with previous adverse pregnancy outcomes would further contribute to the reduction of low birth weight infants. Previous research at IMSS showed that every US dollar spent on family planning services reduced other health-related expenses by $9. Further increasing birth intervals would decrease pregnancies thereby reducing the demand for IMSS health services.

Diagenetic origin of chert lenses in limestone at Soyatal, State of Queretaro Mexico

Diagenetic origin of chert lenses in limestone at Soyatal, State of Queretaro Mexico